/*
 * rbtree.h
 *
 *  Created on: 2014年9月28日
 *      Author: copy from linux kernel
 */

#ifndef RBTREE_H_
#define RBTREE_H_

#include <stddef.h>
#include <cm/cm_constant.h>

#ifdef __cplusplus
extern "C" {
#endif

struct rb_node {
	unsigned long rb_parent_color;
#define RB_RED		0
#define RB_BLACK	1
	struct rb_node *rb_right;
	struct rb_node *rb_left;
}__attribute__((aligned(sizeof(long))));

struct rb_root {
	struct rb_node *rb_node;
};

#define rb_parent(r)	((struct rb_node *)((r)->rb_parent_color & ~3))
#define rb_color(r)	((r)->rb_parent_color & 1)
#define rb_is_red(r)	(!rb_color(r))
#define rb_is_black(r)	rb_color(r)

#define rb_set_red(r)	do {(r)->rb_parent_color &= ~1;}while(0)
#define rb_set_black(r) do {(r)->rb_parent_color |= 1;}while(0)

static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
{
	rb->rb_parent_color = (rb->rb_parent_color & 3) | (unsigned long) p;
}

static inline void rb_set_color(struct rb_node *rb, int color)
{
	rb->rb_parent_color = (rb->rb_parent_color & ~1) | color;
}

#define RB_ROOT (struct rb_root) {NULL, }
#define rb_entry(ptr, type, member) container_of(ptr, type, member)

#define RB_EMPTY_ROOT(root)	((root)->rb_node == NULL)
#define RB_EMPTY_NODE(node)	(rb_parent(node) == node)
#define RB_CLEAR_NODE(node)	(rb_set_parent(node, node))

extern void rb_insert_color(struct rb_node *, struct rb_root *);
extern void rb_erase(struct rb_node *, struct rb_root *);

typedef void (*rb_augment_f)(struct rb_node *node, void *data);

extern void rb_augment_insert(struct rb_node *node, rb_augment_f func,
		void *data);

extern struct rb_node * rb_augment_erase_begin(struct rb_node *node);
extern void rb_augment_erase_end(struct rb_node *node, rb_augment_f func,
		void *data);

extern struct rb_node *rb_next(const struct rb_node *);
extern struct rb_node *rb_prev(const struct rb_node *);
extern struct rb_node *rb_first(const struct rb_root *);
extern struct rb_node *rb_last(const struct rb_root *);

extern void rb_replace_node(struct rb_node *victim, struct rb_node *n,
		struct rb_root *root);

static inline void rb_link_node(struct rb_node *node, struct rb_node *parent,
		struct rb_node **rb_link)
{
	node->rb_parent_color = (unsigned long) parent;
	node->rb_left = node->rb_right = NULL;
	*rb_link = node;
}

#ifdef __cplusplus
}
#endif

#endif /* RBTREE_H_ */
